A new method for forming hard layer containing titanium carbide by EDM with carbon powder mixed fluid using titanium electrode is proposed, and the effects of machining conditions on characteristics of the layer are experimentally investigated. Furthermore, the wear resistance of EDMed surface was evaluated. Experimental analysis made it clear that a thick and smooth TiC layer could be formed on the machined surface by this method. It was also pointed out that the hardness of modified surface became higher with an increase of discharge duration and/or carbon powder concentration in the kerosene type machining fluid, and that the wear resistance of the modified layer was much higher than that of base material.
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